Spindle bolstee



(No Model.)

J. R. GRAY.

SPINDLE BOLSTER.

No. 300,462. Patented June 17, 1884.

UNITED. STATES PATENT @rrrcs.

JAMES It. GRAY, OF AYER, ASSIGNOR TO GEO. DBAPER 8t SONS, OF HOPE- DALE,MASSACHUSETTS.

SPlN DLE-BOLSTER.

SPECIFICATION forming part of Letters Patent No. 300,462, dated June 17,1884.

(No model.)

2" 0 aZZ whom, it may concern.-

Be it known that I, JAMES 12-. GRAY, of Ayer, county of Middlesex, Stateof Massachusetts, have invented an Improvement in SpindleBolsters, ofwhich the following description, in connection with the accompanyingdrawing, is a specification, like letters on the drawing representinglike parts.

This invention relates more especially to the construction of thebolster placed in the bolster-case, the said bolster being composed oftwo or more sleeves tapered or made conical in the direction of theirlength, the taper being preferably from end to end, and produced.preferably, by the reduction of the external surface of each of the saidsleeves, thus leaving between the outside of theinnermost sleeve of theseries and the one next outside of it, and between the outside sleeveand the inte rior of the bolster-case, wedgeshaped tapering spaces, thewider portions of the said spaces being alternately at difierentheights, or first opposite the lower and then opposite the upper ends ofthe said sleeves, whereby the said sleeves are free to yield or move toa limited extent in any direction radially when acted upon by thespindle as the latter moves to seek its true center of rotation, thesaid loosely-held sleeves constituting a compound bushing, taking up andreceiving the blows of the spiudle-blows caused by unequal loading andhigh speed of rotation.

I do not broadly claim a compound bolster, or one made of severalconcentric sleeves placed in an oil-chamber of a bolster-case closed atits bottom.

The drawing represents in elevation a spindle having on it asleevewhirl, the said whirlbolstei', bolster-case, and stop and nutbeing in section.

The spindle A, its sleeve-whirl B, the bolster-case G, rail D, and nut Eare and may be all as usual, the bolster being closed at its bottom andchambered to receive the oil, which will be applied or supplied theretoin any usual manner, but preferably automatically,

as in the so-callet Rabbeth spindle. The bottom of the band-groove inthe whirl will preferably be at about the center of the bushing, ormidway between its ends.

The bolster is composed of two tapering sleeves, a b, one surroundingthe other. The. sleeve (4 is bored to fit the spindle; but from itsupper enddownward, as shown, it is tapered. The bore of the sleeve bisequal in diameter to the external diameter of the inner sleeve at itslargest part, and externally it is tapered from one to its other end, asdescribed, of the sleeve a; but the sleeve 1) has its reduced or thinend uppermost, while sleeve a has its reduced or thin end down.Arranging the sleeves a b in this way leaves spaces 0 d between theparts, as shown in white, so that the sleeves constituting the bolsterare free to yield to the pressure of the lower end of the spindle as thesame wanders on its end support to seek its true center of rotation. Thebolster-case closed at its bottom serves as an oil well, and the oilbetween the independent sleeves constituting the bolster acts to form ayielding packing. The tapering sleeves are provided with elongated holesto receive a pin or projection, f, fastened to the bolster-case andextended into the said holes, the said projeetion acting to restrain thesaid sleeves from 7 5 rotation with the spindle, but permitting the saidsleeves to slide as the foot of the spindle wanders on its step.

I claiin The spindle bolster-casapin or projection, combined with thecompound bolster, composed of two or more tapering sleeves adapted toreceive oil in the tapering oil-receiving space between them,substantiallyas set forth.

In testimonywhereof I have signed myname 8 5 to this specification inthe presence of two subscribing witnesses.

JAMES R. GRAY.

\Vitnesses:

Geo. W. GREGORY, W. H. SIGsToN.

